You have four 2.5ʺ hard drives on hand and need a replacement drive for a desktop system. the documentation for the motherboard installed in the system says the board has six sata 3 gb/s connectors and one ide connector. which of the four hard drives will work in the system and yield the best performance?

This question includes several options which are:

Ultralock IDE ATA 4500-RPM 3.5ʺ HDD

WD 3.5ʺ 7200-RPM SATA 3.0 HDD

Seagate IDE ATA 4500-RPM 3.5ʺ HDD

WD 2.5ʺ 4500-RPM SATA 6 Gb/s HDD

The Bus interface "Serial ATA" or SATA which uses Serial Signaling Technology (data sent sequentially 1 bit at a time) is designed to host various types of mass storage devices, including of course hard disk drives; and requires hot plugging/swapping devices, to add/plug/unplug and replace without rebooting or shutting it down; Western Digital HDD devices are great all rounders and offer exceptional performance, including content creation and gaming. From the 4 options provided, the most compatible one, promising the best performance would be the: WD 3.5" 7200-RPM SATA 3.0 HDD, especially due being faster with its 7200 Rotations per minute, it also has a high transfer rate, less prone to over heat and minimizes noise levels, plus is available almost everywhere on the market.

Thus the most suitable option would definitely be the 2nd one:

WD 3.5" 7200-RPM SATA 3.0 HDD